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Publication
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| Research Title |
Preparation of ZnO-smectites and their photocatalytic activity |
| Date of Distribution |
6 September 2012 |
| Conference |
| Title of the Conference |
The 2nd Asian Clay Conference |
| Organiser |
Global Biomaterials and Nano-Medicine (Global BNM), Kaolin Regional Innovation System Agency |
| Conference Place |
Ewha Womans University |
| Province/State |
Seoul (Republic of Korea) |
| Conference Date |
6 September 2012 |
| To |
8 September 2012 |
| Proceeding Paper |
| Volume |
- |
| Issue |
- |
| Page |
- |
| Editors/edition/publisher |
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| Abstract |
The preparation of hybrid materials of semiconductors, including metal oxides, and layered inorganic solids has been extensively studied because of the useful properties controlled by host-guest and guest-guest interactions. ZnO is a well-known semiconductor with a wide range of applications as pigments, UV shielding, photocatalyst, and solar cell. The immobilization of ZnO in between inorganic layers has been done previously to show peculiar properties such as optical and photocatalytic ones [1], while the possible variation of nanostructures and host-guest systems motivate us to conduct further studies on the materials variation and structure-property relationship. Here, we focused on the formation of ZnO in smectites (montmorillonite and saponite), to show the optical and photocatalytic properties.
ZnO-smectites were prepared by mixing the aqueous solutions of ZnCl2 and NaOH with the dispersion of Na-smectites and stirred at 70 C for 1 day. The XRD patterns of the hybrids showed the symmetrical d001 peaks with the d001 values of 1.51 and 1.40 nm for ZnO-montmorillonite and ZnO-saponite, respectively. The reflections due to hexagonal wurtzite ZnO located at d = 0.28, 0.26 and 0.25 nm were also observed in the XRD patterns of the hybrids, attributing to the presence of ZnO crystal on the external surface of smectites. The photoluminescence spectra of the hybrids showed the emission bands due to ZnO at 548 nm for ZnO-montmorillonite and at 545 nm for ZnO-saponite [2]. The luminescence intensity of ZnO-saponite was stronger than that of ZnO-montmorillonite because of the smaller quantity of quenching impurity in saponite. The photocatalytic degradation efficiencies of methylene blue by UV irradition were higher when ZnO-montmorillonite and saponite were used if compared with that when bare ZnO was used, indicating that the destruction of ZnO under acid condition was prevented by smectites.
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| Peer Review Status |
ไม่มีผู้ประเมินอิสระ |
| Level of Conference |
นานาชาติ |
| Type of Proceeding |
Abstract |
| Type of Presentation |
Poster |
| Part of thesis |
true |
| Presentation awarding |
false |
| Attach file |
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| Citation |
0
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Journal Publication
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